I'm amazed (though I shouldn't be surprised) at how organized I have to be in order to write my novel. I have a ton of word documents that I'm using to keep all the details straight. One if for characters and EVERY time I throw in a new character, even somebody who gets one line in passing, gets their name and a brief description written down so I can remember who they were, if necessary. Major characters, of course, get all sorts of details written about them. There's also a list of the names of places, ships, buildings, etc. I also have a Timeline document, complete with a mini calendar of the year this story takes place and notes of what days (and in some cases, at what time) each major event happens so I can find it again and don't contradict myself. Then, of course, there's a large list of details that I still need to decide on. For example, I haven't named the main spaceship yet because I want to put some major thought into what it will be, but I didn't want to avoid writing the story until I made that decision, so I simply write SHIP each time its name would appear. SHIP appears in my master list of things I need to decide on, and I'll be able to do a global search and replace once I have a real name. The list of items like this is quite long already. I have another to-do list of small snippets, fractions of scenes, or other details that I've decided need to be inserted somewhere. Each of these lists are in various stages of completion. I also have a list of chapters with the POV character of each and the word count. With stories, they're usually small enough that I don't have to worry about getting confused about what I previously wrote, so I've never needed to do all this before. It's a new experience, but fortunately I'm capable of being extremely organized, so I'm able to keep up. So long as I don't allow a new organizational project to distract me for actually writing something.
p.s. Day 83 and counting of not taking a day off!